The Titanic had a rotary spark gap transmitter, which has a unique ‘sound’.
Here is a recreation of the SOS from Titanic as might have been heard by “HAM” operators that fateful night
https://www.youtube.com/watch?v=snkwsU98QlQ
What’s interesting to consider is that that was the first time the wireless was used in an emergency situation. Sending wireless telegrams was considered a fun little novelty from when Marconi invented the device (and of course tested it in Newfoundland). The ships’ wireless operators would usually be in bed by about 11:00pm (24 hour surveillance was not required until after the TITANIC sinking).
The much closer Californian’s wireless operator tried conversing with the one from the Titanic right before the collision with the iceberg but was told “Shut up, you are jamming my signal”. He thus turned off his set and went to bed. Had he stayed up later like the Carpathia’s did, the Californian would likely have been on the scene before the Titanic even sank and possibly saved all lives lost that night.